ENGINTRON configuration recheck

Hi I have 3 websites on a VPS. We've had ENGINTRON installed serving NGINX as reverse proxy in front of Apache for a while. Ran update of ENGINTRON. One of the 3 websites that has a separate dedicated IP address distinct from the VPS IP (on which other two sites are running very well even now), has stopped serving. Can you get into my WHM and check the configuration for NGINX as reverse proxy and ensure all 3 sites work smoothly. Kindly note each of the 3 sites has its separate cloudflare account. So you have to check configuration for NGINX as reverse proxy with cloudflare in ENGINTRON.